<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Java 在线 OJ 平台</title>
        <meta name="description" content="Charcoal is a free Bootstrap 4 UI kit build by @attacomsian at Wired Dots." />
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        <!--Bootstrap 4-->
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    <body>

        <nav class="navbar navbar-expand-md navbar-dark fixed-top sticky-navigation" id="nav">
            <a class="navbar-brand font-weight-bold" href="#">在线OJ</a>

<!--            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#topMenu" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">-->
<!--                <span class="navbar-toggler-icon"></span>-->
<!--            </button>-->

            <div class="collapse navbar-collapse" id="topMenu">

            </div>

            <a class="navbar-brand font-weight-bold" href="index.html">主页</a>
            <a class="navbar-brand font-weight-bold" href="javascript:void(0);"  onclick=logout()>注销</a>
        </nav>

        <!--hero section-->
        <section class="bg-hero">
            <div class="container">
                <div class="row vh-100">
                    <div class="col-sm-12 my-auto text-center">
                        <h1>在线 OJ</h1>
                        <p class="lead text-capitalize my-4">
                            基于 Java-SpringBoot 搭建的在线 OJ 平台
                        </p>
                        <a href="https://gitee.com/chenruiqi21/OJ_Project" target="_blank" class="btn btn-outline-light btn-radius btn-lg">项目链接</a>
                    </div>
                </div>
            </div>
        </section>

        <!--components-->
        <section class="my-5 pt-5">
            <div class="container">

                <!-- Tables  -->
                <div class="row mb-5" id="tables">
                    <div class="col-sm-12">
                        <div class="mt-3 mb-5">
                            <h3>题目列表</h3>
                            <table class="table">
                                <thead class="thead-dark">
                                    <tr>
                                        <th>ID</th>
                                        <th>题目</th>
                                        <th>难度</th>
                                    </tr>
                                </thead>
                                <tbody id="problemTable">
                                  
                                    <!-- <tr>
                                        <td>1</td>
                                        <td><a href="/question/{{id}}">两数之和</a></td>
                                        <td>简单</td>
                                    </tr>
                                    -->


                            
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <!--footer-->
        <section class="py-5 bg-dark">
            <div class="container">
                <div class="row">
                    <div class="col-md-6 offset-md-3 col-sm-8 offset-sm-2 col-xs-12 text-center">
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                            Join the waiting list to get notified when we release it (plus discount code).
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                        <p class="pt-2 text-muted">
                            &copy; 2022 RAIN 7
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        <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
        <script src="js/app.js"></script>
        <script>
            // 在页面加载的时候，尝试从服务器获取题目列表，通过 ajax 的方式来进行获取

            getUserManageMdel();
            function getUserManageMdel() {
                // 满足一定的条件要把a标签给加上
               $.ajax({
                   url:"usermanage/isload",
                   type:"POST",
                   success:function (data,status) {
                      if(data.state===6050){// 当前用户是管理员用户
                          let a1 =document.createElement("a");
                          a1.href="userManage.html";
                          a1.innerHTML="用户信息管理模块";
                          a1.className ="navbar-brand font-weight-bold";

                          let a2 =document.createElement("a");
                          a2.href="problemManage.html";
                          a2.innerHTML="题目信息管理模块";
                          a2.className ="navbar-brand font-weight-bold";

                          let nav = document.querySelector("#nav");
                          nav.appendChild(a1);
                          nav.appendChild(a2);
                      }
                      // 如果不是的话，那么是普通用户，就什么都不做
                   }
               })
            }

            function getProblems() {
                // 1. 通过 ajax 从服务器获取到题目列表
                $.ajax({
                    url:"oj/problems",
                    type:"GET",
                    success:function (data,status) {
                        makeProblemTable(data);
                    },
                    error:function () {
                        alert("服务器异常，获取题目信息失败!");
                    }
                })
            }

              function makeProblemTable(data){
                  // 通过这个函数把数据转换成HTML 片段
                  let problemTable = document.querySelector("#problemTable");
                    for(let problem of data ){

                        let tr = document.createElement("tr");
                        let tdId = document.createElement("td");

                        tdId.innerHTML = problem.id;
                        tr.appendChild(tdId);

                        let tdTitle = document.createElement("td");

                        let a = document.createElement("a");

                        a.innerHTML = problem.title;

                        //TODO 
                        a.href = "problemDetail.html?id="+problem.id;
                        a.target = "_blank";


                        tdTitle.appendChild(a);
                        tr.appendChild(tdTitle);

                        let tdLevel = document.createElement("td");
                         tdLevel.innerHTML = problem.level;
                         tr.appendChild(tdLevel);

                         problemTable.appendChild(tr);
                    }


            }

            getProblems();

            function logout() {
                $.ajax({
                    url:"state/logout",
                    type:"POST",
                    success:function (data,status) {
                        alert(data.message);
                        if(data.state===5002){
                            location.href="login.html";
                        }
                    }
                })
            }

        </script>
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